Maco Prototype IR film...

[Scott --]

I'd say that is an excellent result!

Thank you!

[Eugen Mezei]

IIRC the tanks which were IR-transparent were a few ranges of 1980s, cheap, blow-moulded, dyed plastic tanks. They are both no longer made and never very strong even when new, so are unlikely to be in use nowadays.

What about baquelite ones?

[Cor]

Sorry to get back so late, but I found my testing of the IR prototype film (back in 2007)

Shot at 8asa
70 filter
Processed in PyrocatHD 1:1:100, 22degC, 16 minutes

The film is indeed very thin/flimsy, and has a rather nasty big notch code: a triangle, which gets into the image area.

did not find the prints yet, but judging the negatives: there is a prominent IR effect. I see that you are getting there also !

Best,

Cor

[MartinP]

What about baquelite ones?

Apart from Minox, I have never tried a bakelite tank in any size or format, but most bakelite products I have seen tend to be quite 'chunky' as the plastic is relatively weak. That suggests that there is enough material for them to be IR proof. A test would be to expose a sheet to give a light grey tone, then cut it in half and develop one part in the bakelite tank after leaving it in the sun all day, and the other part in a way that you know to be good (a modern tank, or a tray). Compare the results and then you'll know for sure. Of course, a photo of the tank and the results back in the thread would then help others.